package com.clps.rulesregulations.service.impl;

import com.clps.rulesregulations.domain.Resource;
import com.clps.rulesregulations.service.ResourceService;
import com.clps.rulesregulations.service.ShiroService;
import com.github.pagehelper.util.StringUtil;
import org.apache.shiro.spring.web.ShiroFilterFactoryBean;
import org.apache.shiro.web.filter.mgt.DefaultFilterChainManager;
import org.apache.shiro.web.filter.mgt.PathMatchingFilterChainResolver;
import org.apache.shiro.web.servlet.AbstractShiroFilter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

/**
 * shiro缓存处理
 * @author zhangchao
 * @date 2018-11-06
 */
@Service
public class shiroServiceImpl implements ShiroService {
    @Autowired
    private ShiroFilterFactoryBean shiroFilterFactoryBean;
    @Autowired
    private ResourceService resourcesService;
    /**
     * 初始化权限
     */
    public Map<String, String> loadFilterChainDefinitions() {
        // 权限控制map.从数据库获取
        Map<String, String> filterChainDefinitionMap = new LinkedHashMap<String, String>();
        filterChainDefinitionMap.put("/logout", "logout");
        filterChainDefinitionMap.put("/css/**","anon");
        filterChainDefinitionMap.put("/login","anon");
        filterChainDefinitionMap.put("/js/**","anon");
        filterChainDefinitionMap.put("/img/**","anon");
        filterChainDefinitionMap.put("/validateCode","anon");
        filterChainDefinitionMap.put("/node_modules/**","anon");
        filterChainDefinitionMap.put("/font-awesome/**","anon");
        // api直接通过
        filterChainDefinitionMap.put("/api/**","anon");

        List<Resource> resourcesList = resourcesService.findAll();
        for(Resource resources:resourcesList){

            if (StringUtil.isNotEmpty(resources.getUrl())) {
                String permission = "perms[" + resources.getUrl()+ "]";
                filterChainDefinitionMap.put(resources.getUrl(),permission);
            }
        }
        filterChainDefinitionMap.put("/**", "authc");
        return filterChainDefinitionMap;
    }
    /**
     * 重新加载权限
     */
    public void updatePermission() {

        synchronized (shiroFilterFactoryBean) {

            AbstractShiroFilter shiroFilter = null;
            try {
                shiroFilter = (AbstractShiroFilter) shiroFilterFactoryBean.getObject();
            } catch (Exception e) {
                throw new RuntimeException("get ShiroFilter from shiroFilterFactoryBean error!");
            }

            PathMatchingFilterChainResolver filterChainResolver = (PathMatchingFilterChainResolver) shiroFilter
                    .getFilterChainResolver();
            DefaultFilterChainManager manager = (DefaultFilterChainManager) filterChainResolver.getFilterChainManager();

            // 清空老的权限控制
            manager.getFilterChains().clear();

            shiroFilterFactoryBean.getFilterChainDefinitionMap().clear();
            shiroFilterFactoryBean.setFilterChainDefinitionMap(loadFilterChainDefinitions());
            // 重新构建生成
            Map<String, String> chains = shiroFilterFactoryBean.getFilterChainDefinitionMap();
            for (Map.Entry<String, String> entry : chains.entrySet()) {
                String url = entry.getKey();
                String chainDefinition = entry.getValue().trim().replace(" ", "");
                manager.createChain(url, chainDefinition);
            }
        }
    }
}
